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1.1 This specification covers a group of common requirements that shall apply to carbon, alloy and stainless steel fasteners or fastener materials, or both, under any of the following ASTM Specifications (or under any other ASTM Specifications that invoke this specification or portions thereof):

Title of SpecificationsASTM DesignationAlloy-Steel and Stainless Steel Bolting Materials for High-Temperature ServiceA 193/A 193MCarbon and Alloy Steel Nuts for Bolts for High Pressure and High-Temperature ServiceA 194/A 194MAlloy Steel Bolting Materials for Low-Temperature ServiceA 320/A 320MAlloy-Steel Turbine-Type Bolting Material Specially Heat Treated for High-Temperature ServiceA 437/A 437MHigh-Temperature Bolting Materials With Expansion Coefficients Comparable to Austenitic Stainless SteelsA 453/A 453MAlloy-Steel Bolting Materials for Special ApplicationsA 540/A 540M

1.2 In case of conflict the requirements of the individual product specification shall prevail over those of this specification.

1.3 Additional requirements may be specified by mutual agreement between the purchaser and supplier.

1.4 Values stated in either inch-pound or SI units (metric) are to be regarded separately. The SI units are shown in brackets within the text and tables. The values stated in each system are not exact equivalents, therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Inch-pound units shall apply unless the "M" designation of the product specification is specified in the order.